如何在C＃中使用[DllImport（“”））]？ [英] How to use [DllImport("")] in C#?

问题描述

我发现了很多关于它的问题，但是没有人解释如何使用它。

I found a lot of questions about it, but no one explains how I can use this.

我有这个问题：

using System;
using System.Collections.Generic;
using System.Linq;
using System.Runtime.InteropServices;
using System.Windows.Forms;
using Microsoft.FSharp.Linq.RuntimeHelpers;
using System.Diagnostics;
using System.Runtime.InteropServices;
using System.IO;

public class WindowHandling
{
    public void ActivateTargetApplication(string processName, List<string> barcodesList)
    {
        [DllImport("User32.dll")]
        public static extern int SetForegroundWindow(IntPtr point);
        Process p = Process.Start("notepad++.exe");
        p.WaitForInputIdle();
        IntPtr h = p.MainWindowHandle;
        SetForegroundWindow(h);
        SendKeys.SendWait("k");
        IntPtr processFoundWindow = p.MainWindowHandle;
    }
}

有人可以帮助我了解为什么它给了我一个 DllImport 行和 public static 行出错？

Can someone help me to understand why it gives me an error on the DllImport line and on the public static line?

有人知道吗，我该怎么办？
谢谢。

Does anyone have an idea, what can I do? Thank you.

推荐答案

您不能声明 extern 方法内部的本地方法，或具有属性的任何其他方法。将您的DLL导入移动到该类中：

You can't declare an extern local method inside of a method, or any other method with an attribute. Move your DLL import into the class:

using System.Runtime.InteropServices;


public class WindowHandling
{
    [DllImport("User32.dll")]
    public static extern int SetForegroundWindow(IntPtr point);

    public void ActivateTargetApplication(string processName, List<string> barcodesList)
    {
        Process p = Process.Start("notepad++.exe");
        p.WaitForInputIdle();
        IntPtr h = p.MainWindowHandle;
        SetForegroundWindow(h);
        SendKeys.SendWait("k");
        IntPtr processFoundWindow = p.MainWindowHandle;
    }
}

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